Th

Definitions of Th

1. noun

   the fifth day of the week; the fourth working day
   synonyms: Thursday

   type of:

   weekday

   any day except Sunday (and sometimes except Saturday)
2. noun

   a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
   synonyms: atomic number 90, thorium

   types:

   radiothorium, thorium-228

   radioactive isotope of thorium with mass number 228

   type of:

   metal, metallic element

   any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.